AT&T PARADYNE DATAPORT EXPRESS 3740 Modem Type Data (synchronous/asynchronous)/Fax Maximum Data Rate 28.8Kbps Maximum Fax Rate 14.4Kbps Data Bus External Fax Class Class I & II Data Modulation Protocol Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 Rockwell V.FC Fax Modulation Protocol ITU-T V.17, V.27ter, V.29 Error Correction/Compression MNP5, V.42, V.42bis [Image] CONNECTIONS Purpose Location Purpose Location Line out CN1 DC power CN4 Line in CN2 Power switch SW1 RS-232/422 CN3 DIAGNOSTIC LED(S) LED Color Status Condition TST Red On Modem test executing TST Red Off Normal operation HS Red On Modem is operating at highest configured rate HS Red Off Modem is operating at less than highest rate EC Red On Error correction activated EC Red Off Error correction not activated CD Red On Carrier signal detected CD Red Off Carrier signal not detected OH Red On Modem is off-hook OH Red Off Modem is on-hook RD Red On Modem is receiving data RD Red Off Modem is not receiving data SD Red On Modem is transmitting data SD Red Off Modem is not transmitting data TR Red On DTR signal is high TR Red Off DTR signal is low MR Red On Power is on MR Red Off Power is off Proprietary AT Command Set AUTO BAUD Type: Register Format: AT [cmds] S78=n [cmds] Example: AT S78=0 &W Description: Allows modem to connect at remote modem’s modulation. Command Function » S78=0 Auto baud enabled. S78=1 Auto baud disabled. AUTO-RELIABLE TIME BUFFER CONFIGURATION Type: Configuration Format: AT [cmds] \Cn [cmds] Example: AT \C1 &W Description: Controls the handling of incoming data during auto-reliable time period. Command Function » \CO Data is discarded. \C1 Data is buffered. \C2 Data is discarded, resets to \C1 on receipt of autoreliable fallback character. AUTO-RELIABLE FALLBACK CHARACTER Type: Register Format: AT [cmds] %An [cmds] Example: AT%A20 Default: 19 Range: 0-127 Unit: ASCII Description: Sets the character used as the auto-reliable fallback character. %A0 will disable this function. BAUD RATE ADJUST Type: Configuration Format: AT [cmds] \Jn [cmds] Example: AT &B0 \J0 Description: Allows baud rate to follow serial port speed Command Function » \J0 Baud rate adjust disabled. \J1 Baud rate adjust enabled. BREAK SEND Type: Configuration Format: AT [cmds] \Bn [cmds] Example: AT \B3 &W Range: 1-25 Default 3 Unit: .1 second Description: Sends break to modem. BREAK TYPE Type: Configuration Format: AT [cmds] \Kn [cmds] Example: AT \K5 &W Description: Selects response to DTE break command. Command Function \K0 Send break, clear buffer, enter command mode. \K1 Send break, clear buffer \K2 Send break, send data, enter command mode. \K3 Send break. send data, \K4 Send data, send break, enter command mode. » \K5 Send data, send break. COMPRESSION Type: Configuration Format: AT %Cn Example: AT &B0 %C1 &I2 Description: Selects data compression. Command Function %C0 Data compression disabled. » %C1 Data compression enabled. CONNECT MODE Type: Configuration Format: AT [cmds] \Nn [cmds] Example: AT \N1 DT555-1212 Description: Sets connect mode. Command Function \N0 Normal mode enabled. \N1 Direct mode enabled. \N2 MNP mode only enabled. \N3 MNP mode with fallback to normal mode enabled. \N4 V.42 mode only enabled. \N5 V.42 mode with fallback to normal mode enabled. \N6 V.42/MNP mode only enabled. » \N6 V.42 mode with fallback to normal mode enabled. CTS SIGNAL Type: Configuration Format: AT [cmds] \Dn [cmds] Example: AT \D0 Description: Selects the function of the CTS signal. Command Function \D0 CTS forced high. » \D1 CTS follows DTR. ECHO DATA Type: Configuration Format: AT [cmds] \En [cmds] \Example: AT \E0 Description: Enables modem to echo received data. Command Function \E0 Data echo disabled. » \E1 Data echo enabled. FLOW CONTROL Type: Configuration Format: AT [cmds] \Gn [cmds] Example: AT \G1 &K3 Description: Selects modem port flow control. Command Function » \G0 Flow control disabled. \G1 Flow control enabled. FLOW CONTROL TYPE Type: Configuration Format: AT [cmds] \Qn [cmds] Example: AT \Q5 Description: Sets type of flow control used by modem. Command Function \Q0 Flow control disabled. \Q1 Bidirectional XON/XOFF flow control enabled. \Q2 CTS flow control by DCE enabled. » \Q3 Bidirectional CTS/RTS flow control enabled. \Q4 XON/XOFF flow control by DCE enabled. HELP SCREENS Type: Immediate Format: AT %H Example: AT %H Description: Displays list of AT commands and their descriptions INACTIVITY TIMER Type: Configuration Format: AT [cmds] \Tn [cmds] Example: AT\T20 Default: 0 Range: 0-255 Unit: 1 minute Description: Sets the length of time that the modem does not receive information before it disconnects. LAP-M FRAME SIZE Type: Configuration Format: AT [cmds] \An [cmds] Example: AT \A3 %C1 Description: Sets the maximum number of characters per frame of data. Command Function \A0 Maximum frame size is 64 \A1 Maximum frame size is 128 \A2 Maximum frame size is 192 » \A3 Maximum frame size is 256 MODE SELECTION Type: Immediate Format: AT [cmds] +FCLASS=n Example: AT +FCLASS=8 Description: Sets what mode the modem will operate in. Command Function +FCLASS=0 Data mode. +FCLASS=1 Class 1 fax mode. +FCLASS=2 Class 2 fax mode. +FCLASS? Displays current setting MODULATION SELECT Type: Configuration Format: AT [cmds] %Mn [cmds] Example: AT %M0 &W Description: Selects whether V.34 or V.FC is used at 28.8Kbps Command Function » %M0 V.34 and V.FC enabled. %M1 V.34 only enabled. %M2 V.FC only enabled. PROTOCOL/SPEED Type: Immediate Format: AT [cmds] %Bn [cmds] Example: AT %B14400 Description: Selects the current DCE speed. Command Function %B300 Select V.21 or Bell103 at 300bps speed. %B1200 Select V.22,V.23 or Bell 212A at 1200bps speed. %B2400 Select V.22 at 2400bps speed. %B4800 Select V.34 at 4800bps speed. %B7200 Select V.34 at 7200bps speed. %B9600 Select V.34 at 9600bps uncoded speed. %B12000 Select V.34 at 12Kbps speed. %B14400 Select V.34 at 14.4Kbps speed. %B16800 Select V.34 at 16.8Kbps speed. %B19200 Select V.34 at 19.2Kbps speed. %B21600 Select V.34 at 21.6Kbps speed. %B24000 Select V.34 at 24Kbps speed. %B26400 Select V.34 at 26.4Kbps speed. » %B28800 Select V.34 at 28.8Kbps speed. %BL2400 Select V.22bis at 2400Kbps speed. %BL4800 Select V.32bis/V.32 at 4800Kbps speed. %BL7200 Select V.32bis at 7200Kbps speed. %BL9600 Select V.32bis/V.32 at 9600Kbps speed. %BL12000 Select V.32bis at 12Kbps speed. %BL14400 Select V.32bis at 14.4Kbps speed. V.32bis AUTO-RETRAIN Type: Register Format: AT [cmds] S76=n [cmds] Example: AT S76=0 &W Description: Selects action the modem will take during bad line quality on 32bis connection. Command Function » S76=0 Auto retrain enabled. S76=1 Auto retrain disabled. XON/XOFF PASS-THROUGH Type: Configuration Format: AT [cmds] \Xn [cmds] Example: AT \X7 O Description: Selects whether XON/XOFF signals are sent to remote modem. Command Function » \X0 XON/XOFF signals trapped by local modem. \X1 XON/XOFF passed through local modem.